Flange heightening structure at manhole of SCR (Selective Catalytic Reduction) reactor

Abstract

The utility model relates to the technical field of SCR (Selective Catalytic Reduction) reactors, and discloses a flange heightening structure at a manhole of an SCR reactor, which comprises a reactor shell and an arranged rectangular flange, and a straight pipe section is arranged on the back surface of the rectangular flange; pressing plate screws are connected to the two sides of the front face of the catalyst pressing plate, pressing plate nuts are connected to the surfaces of the pressing plate screws, and rib plates are installed at the top and the bottom of the straight pipe section; a manhole cover bolt is additionally arranged between the manhole cover and the rectangular flange, and a rectangular flange nut and a gasket are additionally arranged on the surface of the manhole cover bolt. According to the flange heightening structure at the manhole of the SCR reactor, the rectangular straight pipe section is additionally arranged between the rectangular flange and the reactor shell to raise the surface of the rectangular flange, the pressing plate nut is screwed into the welding pressing plate screw, then the pressing plate nut is screwed until a catalyst pressing plate in the middle presses a catalyst, and the manhole cover is installed; and the manhole cover bolt is screwed into the rectangular flange nut. And the catalyst and the reactor are attached more tightly.

Description

Technical Field

[0001] The utility model relates to the technical field of SCR reactors, in particular to a flange heightening structure at a manhole of an SCR reactor. Background Art

[0002] The SCR reactor utilizes selective catalytic reduction technology. Ammonia or another suitable reducing agent is injected into the flue gas upstream of the catalyst. The catalyst converts NOx in the flue gas into nitrogen and water. Because NH3 is selective, it reacts only with NOx and rarely with O2, hence the name "selective catalytic reduction denitrification." The SCR reactor has a manhole for loading the catalyst, requiring catalyst mounting hardware to secure the catalyst. To ensure a tight seal at the SCR reactor manhole, a flange is required.

[0003] Common SCR reactor manhole flanges typically consist of a flange body, gaskets, bolts, nuts, and other accessories. The gasket is typically placed between the sealing surfaces of the two flanges, while bolts and nuts secure the two flanges together. Other accessories, such as gasket clamps and protective coatings, increase the gasket's compression force, improve its sealing performance, and protect the flanges and their accessories from corrosion and wear.

[0004] The flange at the manhole of the traditional SCR reactor is designed to be used to load the catalyst. Therefore, a catalyst mounting part is required to press the catalyst. The early design of the catalyst installation used angle steel as a pressure plate to press the catalyst. The angle steel needs to be inserted into the gap between the manhole shell and the catalyst. In addition, due to the design angle, in order to press each piece of catalyst, the length of the angle steel is a distance longer than the width of the manhole. However, this method makes it inconvenient to operate, and due to the small space, it is easy to be squeezed and bent during operation, resulting in deformation of the angle steel and not being able to completely fit the catalyst. In addition, when connecting the rectangular flange and the manhole cover, bolts and movable nuts are used. When the reactor is in a high temperature environment for a long time, the oxide layer on the surface of the bolts and nuts increases the friction, causing the bolts and nuts to bite, making it impossible to unscrew and damaging the flange body structure. For this reason, a flange heightening structure for the manhole of the SCR reactor is proposed. Utility Model Content

[0005] (1) Technical problems solved

[0006] In view of the shortcomings of the existing technology, the present invention provides a flange heightening structure at the manhole of the SCR reactor to solve the technical problems of the above-mentioned deformation of the angle steel, inability to fully adhere to the catalyst, and inability to unscrew it, thereby damaging the flange body structure.

[0007] (2) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a flange heightening structure at the manhole of an SCR reactor, comprising:

[0009] A reactor shell, and rectangular flanges provided on the upper and lower portions of the front surface of the reactor shell, with straight pipe sections installed on the back surfaces of the rectangular flanges, the straight pipe sections being connected to the reactor shell;

[0010] The catalyst pressure plate is arranged at the center of the inner cavity of the straight pipe section, and the front sides of the catalyst pressure plate are connected with pressure plate screws, and the surface of the pressure plate screws is connected with pressure plate nuts, and ribs are installed on the top and bottom of the straight pipe section;

[0011] The manhole cover is set on the front of the rectangular flange, and manhole cover bolts are evenly added between the manhole cover and the rectangular flange, and rectangular flange nuts and gaskets are added to the surface of the manhole cover bolts. The rectangular flange, straight pipe section, rib plate and pressure plate screw are directly welded to the reactor shell, and the rectangular flange nut is welded to the back of the rectangular flange. The straight pipe section is welded by the straight plate part and the bent plate part, and is processed and made by the workshop according to the size requirements of the drawing. The catalyst pressure plate is bent and made by the workshop according to the size requirements of the drawing. A rectangular straight pipe section is added between the rectangular flange and the reactor shell to raise the surface of the rectangular flange. First, the pressure plate nut is screwed into the welded pressure plate screw, and then the pressure plate nut is tightened until the middle catalyst pressure plate presses the catalyst. During the tightening process, it should be ensured that the catalyst pressure plate is evenly stressed. After the catalyst is installed, the manhole cover is installed. The gasket needs to be added and the manhole cover bolts are screwed into the rectangular flange nuts and tightened. Not only can the catalyst installation operation space be increased to a certain extent, but the catalyst installation operation can also be made easier, and the catalyst and reactor can be fitted more closely. The bolts and nuts can also be engaged by directly welding the rectangular flange and the nut, thereby affecting the subsequent disassembly and assembly and damaging the flange body structure. The problem is solved to a certain extent.

[0012] Preferably, a storage box is mounted on the outside of the reactor shell, with a storage slot formed on the top of the storage box and supporting side panels added to the upper portions of both sides of the storage slot. When disassembling the manhole cover from the rectangular flange, since a large number of manhole cover bolts need to be disassembled and assembled, the manhole cover bolts can be placed in the storage slot first, and the number and weight of the manhole cover bolts can then drive the supporting side panels down to the bottom of the storage slot.

[0013] Preferably, guide columns are vertically installed on both sides of the storage box, and return springs are sleeved on the surfaces of the guide columns. The return springs can move along the guide columns.

[0014] Preferably, a slide is sleeved on the upper surface of the guide column, and the slide is tightly fitted with a return spring, and the slide is connected to the load-bearing side plate. When the multiple sets of manhole cover bolts drive the load-bearing side plate to descend, the slide is also driven to descend along the surface of the guide column, squeezing the return spring. When the manhole cover bolts are removed from the storage box for use, the return spring can drive the slide to rise along the surface of the guide column due to the reduced weight, so that the load-bearing side plate also drives the manhole cover bolts to rise inside the storage box, thereby facilitating the storage and retrieval of the manhole cover bolts.

[0015] Preferably, a fixed back plate is installed on the upper and lower parts of the back of the storage box, and a limiting groove is provided at the top center of the fixed back plate. The fixed back plate is connected to the corresponding structure through the limiting groove.

[0016] Preferably, the back of the storage box is provided with a fixed connecting plate connected to the reactor shell. A guide rod is inserted into the top of the fixed connecting plate, and a compression spring is mounted on the surface of the guide rod. A limit block is rotatably connected to the end of the guide rod. The guide rod moves along the fixed connecting plate under the action of the compression spring. When the guide rod drives the limit block through the limit slot, the limit block rotates, causing the limit block to be misaligned with the limit slot. This not only ensures the stability of the connection between the reactor shell and the storage box, but also facilitates assembly and disassembly of the reactor shell and the storage box.

[0017] (3) Beneficial effects

[0018] Compared with the prior art, the present invention provides a flange heightening structure at the manhole of an SCR reactor, which has the following beneficial effects:

[0019] This SCR reactor manhole flange elevation structure is constructed by directly welding a rectangular flange, a straight pipe section, a ribbed plate, and a pressure plate screw to the reactor shell. The rectangular flange nut is welded to the back of the rectangular flange. The straight pipe section is welded from a straight plate portion and a bent plate portion, fabricated by the workshop according to the drawing's dimensional requirements. The catalyst pressure plate is also bent by the workshop according to the drawing's dimensional requirements. A rectangular straight pipe section is added between the rectangular flange and the reactor shell to raise the rectangular flange surface. The pressure plate nut is first screwed into the welded pressure plate screw, then tightened until the middle catalyst pressure plate presses against the catalyst. During the tightening process, the catalyst pressure plate should be evenly stressed at both ends. After the catalyst is installed, the manhole cover is installed, and a gasket is added. The manhole cover bolts are screwed into the rectangular flange nuts and tightened. This not only increases the catalyst installation space to a certain extent and simplifies the catalyst installation operation, ensuring a tighter fit between the catalyst and the reactor, but also directly welding the rectangular flange and nut to ensure that the bolts and nuts interlock, thereby partially solving the problem of hindering subsequent disassembly and damage to the flange structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a partial enlarged diagram of the rectangular flange of the utility model and its connection structure;

[0022] Figure 3 This is a partial enlarged diagram of the catalyst pressure plate and its connection structure of the utility model;

[0023] Figure 4 This is a schematic diagram of the storage box and its connection structure of the utility model.

[0024] In the figure: 1. Reactor shell; 2. Rectangular flange; 3. Straight pipe section; 4. Catalyst pressure plate; 5. Pressure plate nut; 6. Pressure plate screw; 7. Manhole cover; 8. Rib plate; 9. Rectangular flange nut; 10. Manhole cover bolt; 11. Gasket; 12. Storage box; 13. Storage slot; 14. Load-bearing side plate; 15. Guide column; 16. Return spring; 17. Slide plate; 18. Fixed back plate; 19. Limit groove; 20. Limit block; 21. Fixed connecting plate; 22. Guide rod; 23. Extrusion spring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The utility model provides a technical solution, a flange heightening structure at the manhole of an SCR reactor, including: Figure 1 , a reactor shell 1, and rectangular flanges 2 provided on the upper and lower portions of the front face of the reactor shell 1, and a straight pipe section 3 is installed on the back face of the rectangular flange 2, and the straight pipe section 3 is connected to the reactor shell 1;

[0027] See also Figure 3 The catalyst pressure plate 4 is arranged at the center of the inner cavity of the straight pipe section 3, and the front sides of the catalyst pressure plate 4 are connected with pressure plate screws 6, and the surface of the pressure plate screw 6 is connected with a pressure plate nut 5, and the top and bottom of the straight pipe section 3 are installed with ribs 8;

[0028] See also Figure 2The manhole cover 7 is arranged on the front side of the rectangular flange 2, and manhole cover bolts 10 are evenly provided between the manhole cover 7 and the rectangular flange 2, and rectangular flange nuts 9 and gaskets 11 are respectively provided on the surface of the manhole cover bolts 10. By directly welding the rectangular flange 2, straight pipe section 3, rib plate 8 and pressure plate screw 6 to the reactor shell 1, the rectangular flange nut 9 is welded to the back side of the rectangular flange 2, the straight pipe section 3 is welded by the straight plate part and the bent plate part, and is processed and made by the workshop according to the size requirements of the drawing, and the catalyst pressure plate 4 is bent and made by the workshop according to the size requirements of the drawing. A rectangular straight pipe section 3 is added between the rectangular flange 2 and the reactor shell 1 to raise the surface of the rectangular flange 2, first screw the pressure plate nut 5 into the welded pressure plate screw 6, and then tighten the pressure plate nut 5 until the middle catalyst pressure plate 4 presses the catalyst. During the tightening process, it should be ensured that the two ends of the catalyst pressure plate 4 are evenly stressed. After the catalyst is installed, install the manhole cover 7, add a gasket 11, and screw the manhole cover bolt 10 into the rectangular flange nut 9 and tighten it. Not only can the catalyst installation operation space be increased to a certain extent, but the catalyst installation operation can also be simplified, and the catalyst and reactor can be fitted more closely. Moreover, the bolts and nuts can be engaged by directly welding the rectangular flange 2 to the nut, thereby affecting the subsequent disassembly and assembly and damaging the flange body structure. This problem is solved to a certain extent.

[0029] See also Figure 1 A storage box 12 is installed on the outside of the reactor shell 1, and a storage groove 13 is formed on the top of the storage box 12. Load-bearing side plates 14 are added to the upper parts of the two sides of the storage groove 13. When disassembling the manhole cover 7 and the rectangular flange 2, since a large number of manhole cover bolts 10 need to be disassembled and assembled, the manhole cover bolts 10 can be placed in the storage groove 13 first, and the number and weight of the manhole cover bolts 10 drive the load-bearing side plates 14 to the bottom of the storage groove 13.

[0030] See also Figure 4 Guide posts 15 are vertically mounted on both sides of the storage box 12 , and the surfaces of the guide posts 15 are sleeved with return springs 16 . The return springs 16 can move along the guide posts 15 .

[0031] A slide 17 is sleeved onto the upper surface of the guide post 15, tightly fitting with a return spring 16. The slide 17 is connected to the load-bearing side plate 14. When the multiple sets of manhole cover bolts 10 drive the load-bearing side plate 14 downward, they also drive the slide 17 downward along the surface of the guide post 15, squeezing the return spring 16. When the manhole cover bolts 10 are removed from the storage box 12 for use, the reduced weight causes the return spring 16 to drive the slide 17 upward along the surface of the guide post 15, allowing the load-bearing side plate 14 to also drive the manhole cover bolts 10 upward within the storage box 12, thereby facilitating storage and retrieval of the manhole cover bolts 10. Fixed backplates 18 are mounted on the upper and lower portions of the back of the storage box 12, with a limit slot 19 defined in the top center of the fixed backplate 18. The fixed backplate 18 is connected to the corresponding structure via the limit slot 19. A fixed connecting plate 21 is attached to the back of the storage box 12 and connected to the reactor housing 1. A guide rod 22 is inserted into the top of the fixing connecting plate 21. A compression spring 23 is sleeved on the surface of the guide rod 22, and a limit block 20 is rotatably connected to the end of the guide rod 22. Driven by the compression spring 23, the guide rod 22 moves along the fixing connecting plate 21. When the guide rod 22 drives the limit block 20 through the limit slot 19, the limit block 20 rotates, causing the limit block 20 to shift with the limit slot 19. This not only ensures the stability of the connection between the reactor housing 1 and the storage box 12, but also facilitates assembly and disassembly between the reactor housing 1 and the storage box 12.

[0032] This solution: the rectangular flange 2, straight pipe section 3, rib plate 8 and pressure plate screw 6 are directly welded to the reactor shell 1, the rectangular flange nut 9 is welded to the back side of the rectangular flange 2, the straight pipe section 3 is welded by the straight plate part and the bent plate part, and is processed and made by the workshop according to the size requirements of the drawing, and the catalyst pressure plate 4 is bent and made by the workshop according to the size requirements of the drawing. A rectangular straight pipe section 3 is added between the rectangular flange 2 and the reactor shell 1 to raise the surface of the rectangular flange 2, first screw the pressure plate nut 5 into the welded pressure plate screw 6, and then tighten the pressure plate nut 5 until the middle catalyst pressure plate 4 presses the catalyst. During the tightening process, it should be ensured that the two ends of the catalyst pressure plate 4 are evenly stressed. After the catalyst is installed, the manhole cover 7 is installed, and a gasket 11 needs to be added. The manhole cover bolt 10 is screwed into the rectangular flange nut 9 and tightened. When the manhole cover 7 and the rectangular flange 2 are disassembled and assembled, since there are a large number of manhole cover bolts 10 that need to be disassembled and assembled, the manhole cover bolts 10 can be placed in the receiving groove 13 first, and the load-bearing side plate 14 can be driven down under the number and weight of the manhole cover bolts 10, which will also drive the slide plate 17 to descend along the surface of the guide column 15 and squeeze the return spring 16. When the manhole cover bolts 10 are taken out of the receiving box 12 for use, due to the reduction in weight, the return spring 16 can drive the slide plate 17 to rise along the surface of the guide column 15, so that the load-bearing side plate 14 drives the manhole cover bolts 10 to also rise inside the receiving box 12. The guide rod 22 moves along the fixed connecting plate 21 under the action of the extrusion spring 23. When the guide rod 22 drives the limit block 20 to pass through the limit groove 19, the limit block 20 is rotated, so that the limit block 20 is misaligned with the limit groove 19.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flange heightening structure at the manhole of an SCR reactor, characterized in that: include: A reactor shell (1), and rectangular flanges (2) arranged on the upper and lower parts of the front of the reactor shell (1), and a straight pipe section (3) is installed on the back of the rectangular flange (2), and the straight pipe section (3) is connected to the reactor shell (1); The catalyst pressure plate (4) is arranged at the center of the inner cavity of the straight pipe section (3), and pressure plate screws (6) are connected to both sides of the front surface of the catalyst pressure plate (4), and pressure plate nuts (5) are connected to the surface of the pressure plate screws (6), and rib plates (8) are installed on the top and bottom of the straight pipe section (3); A manhole cover (7) is arranged on the front side of the rectangular flange (2), and manhole cover bolts (10) are evenly arranged between the manhole cover (7) and the rectangular flange (2), and rectangular flange nuts (9) and gaskets (11) are respectively arranged on the surfaces of the manhole cover bolts (10).

2. The SCR reactor manhole flange heightening structure according to claim 1, characterized in that: A storage box (12) is installed on the outside of the reactor shell (1), and a storage groove (13) is opened on the top of the storage box (12), and load-bearing side plates (14) are added to the upper parts of both sides of the storage groove (13).

3. The SCR reactor manhole flange heightening structure according to claim 2, characterized in that: Guide columns (15) are vertically installed on both sides of the storage box (12), and the surfaces of the guide columns (15) are sleeved with return springs (16).

4. The SCR reactor manhole flange heightening structure according to claim 3, characterized in that: A slide plate (17) is sleeved on the upper surface of the guide column (15), and the slide plate (17) is tightly fitted with the return spring (16), and the slide plate (17) is connected to the bearing side plate (14).

5. The SCR reactor manhole flange heightening structure according to claim 2, characterized in that: A fixed back plate (18) is installed on the upper and lower parts of the back of the storage box (12), and a limiting groove (19) is provided at the top center of the fixed back plate (18).

6. The SCR reactor manhole flange heightening structure according to claim 5, characterized in that: A fixed connecting plate (21) is provided on the back of the storage box (12), and the fixed connecting plate (21) is connected to the reactor shell (1). A guide rod (22) is inserted into the top of the fixed connecting plate (21), and a compression spring (23) is sleeved on the surface of the guide rod (22), and a limit block (20) is rotatably connected to the end of the guide rod (22).

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